#include <iostream>
#include <string>


int main()
{
    std::string name = "hello";
    //name += "world";
    std::string s = name + "world";  //strcat
    std::cout<<s<<std::endl;
    std::cout<<s.size()<<std::endl;
    std::cout<<name<<std::endl;
    std::cout<< (name == s) <<std::endl;
    return 0;
}